Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2

Abstract

We report x-ray absorption and photoemission spectroscopy of the electronic structure in the normal state of metallic YFe2Ge2. The data reveal evidence for large fluctuating spin moments on the Fe sites, as indicated by exchange multiplets appearing in the Fe 3s core level photoemission spectra, even though the compound does not show magnetic order. The magnitude of the multiplet splitting is comparable to that observed in the normal state of the Fe-pnictide superconductors. This shows a connection between YFe2Ge2 and the Fe-based superconductors even though it contains neither pnictogens nor chalcogens. The implication is that the chemical range of compounds showing at least one of the characteristic magnetic signatures of the Fe-based superconductors is broader than previously thought.

arXiv commentTo appear

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• Non-trivial role of interlayer cation states in iron-based superconductors
• Magnetism in Na-filled Fe-based skutterudites
• Competing magnetic orders in quantum critical Sr${}_3$Ru${}_2$O${}_7$
• Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe${}_2$Ge${}_2$
• Unraveling the origin of Kondo-like behavior in the 3$d$-electron heavy-fermion compound YFe${}_2$Ge${}_2$
• Approaching itinerant magnetic quantum criticality through a Hund's coupling induced electronic crossover in the YFe${}_2$Ge${}_2$ superconductor
• Composition dependence of bulk superconductivity in YFe2Ge2
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• Evidence for proximity of YFe${}_2$Si${}_2$ to a magnetic quantum critical point
• Nearly ferromagnetic metal state in the collapsed tetragonal phase of YFe${}_2$(Ge,Si)${}_2$
• On magnetic structure of CuFe2Ge2: constrains from the 57Fe Mossbauer spectroscopy